Help with arrays and matrices!

[chwex]

I need to multiply two matrices. One has the values interger 0-10 where the values were created randomly and the other one has double values. Both are the same size of 5x31. If I go ahead and print them they look like they have been generated right. This is what I have so far.

i = preciomatriz.length;
 j = ranarray.length;
       for(x=0; x<i; x++){
           for(y=0; y<=j; y++){
               for ( z=0; z<=j; z++) {
                  ventasxdia[x][y] += (double)(preciomatriz[x][z]*ranarray[z][y]); 
                   System.out.println(ventasxdia[x][y]+" ");
               }                 
            }
        }

If there is an easier approach to this let me know. I've been looking around for a bit and i can't get it to work! Thanks in advance!

[Wizard0860]

idk about a way to do this, but looks to me that 5x31 and 5x31 matrices wouldn't normally multiple with each other. 5x31 and 31x5 would, because rows of 1st= columns of 2nd. if this is different in arrays, my apologies.

[chwex]

That's what i was thinking too, but there were some examples I found were people would do it directly how I just stated. Thanks for the response though!